body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background: url(../../images/background/home.png) no-repeat center rgba(0, 0, 0, 0.5);
    background-size: cover;
    background-blend-mode: multiply;
    /* filter: brightness(0.1); 调整亮度，0.5 表示半透明 */
}
.avatar {
    margin: 20px 20px;
    float: left;
}
.home {
    padding: 20px;
}
.welcome-content {
    /*float: left;*/
    margin: 30px 0;
}
.grid-content {
    margin: 10px 0;
    position: relative;
}
.fixed:after {
    content: "";
    clear: both;
    display: block;
    visibility: hidden;
    height: 0;
    width: 0;
}
.little {
    font-size: 16px;
    color: #909399;
    margin-top: 8px;
}
.mid {
    text-align: center;
}